httpcaddyfile: New `acme_eab` option (#3492)

* Adds global options for external account bindings

* Maybe other people use ctags too?

* Use nested block to configure external account

* go format files

* Restore acme_ca directive in test file

* Change Caddyfile config syntax for acme_eab

* Update test

Co-authored-by: Matt Holt <mholt@users.noreply.github.com>

caddyconfig/httpcaddyfile/options.go

@@ -31,8 +31,9 @@ func init() {
 	RegisterGlobalOption("experimental_http3", parseOptTrue)
 	RegisterGlobalOption("storage", parseOptStorage)
 	RegisterGlobalOption("acme_ca", parseOptSingleString)
-	RegisterGlobalOption("acme_dns", parseOptSingleString)
 	RegisterGlobalOption("acme_ca_root", parseOptSingleString)
+	RegisterGlobalOption("acme_dns", parseOptSingleString)
+	RegisterGlobalOption("acme_eab", parseOptACMEEAB)
 	RegisterGlobalOption("email", parseOptSingleString)
 	RegisterGlobalOption("admin", parseOptAdmin)
 	RegisterGlobalOption("on_demand_tls", parseOptOnDemand)
@@ -180,6 +181,34 @@ func parseOptStorage(d *caddyfile.Dispenser) (interface{}, error) {
 	return storage, nil
 }
 
+func parseOptACMEEAB(d *caddyfile.Dispenser) (interface{}, error) {
+	eab := new(caddytls.ExternalAccountBinding)
+	for d.Next() {
+		if d.NextArg() {
+			return nil, d.ArgErr()
+		}
+		for nesting := d.Nesting(); d.NextBlock(nesting); {
+			switch d.Val() {
+			case "key_id":
+				if !d.NextArg() {
+					return nil, d.ArgErr()
+				}
+				eab.KeyID = d.Val()
+
+			case "hmac":
+				if !d.NextArg() {
+					return nil, d.ArgErr()
+				}
+				eab.HMAC = d.Val()
+
+			default:
+				return nil, d.Errf("unrecognized parameter '%s'", d.Val())
+			}
+		}
+	}
+	return eab, nil
+}
+
 func parseOptSingleString(d *caddyfile.Dispenser) (interface{}, error) {
 	d.Next() // consume parameter name
 	if !d.Next() {

caddyconfig/httpcaddyfile/tlsapp.go

@@ -348,13 +348,15 @@ func (st ServerType) buildTLSApp(
 // true, a non-nil value will always be returned (unless there is an error).
 func newBaseAutomationPolicy(options map[string]interface{}, warnings []caddyconfig.Warning, always bool) (*caddytls.AutomationPolicy, error) {
 	acmeCA, hasACMECA := options["acme_ca"]
-	acmeDNS, hasACMEDNS := options["acme_dns"]
 	acmeCARoot, hasACMECARoot := options["acme_ca_root"]
+	acmeDNS, hasACMEDNS := options["acme_dns"]
+	acmeEAB, hasACMEEAB := options["acme_eab"]
+
 	email, hasEmail := options["email"]
 	localCerts, hasLocalCerts := options["local_certs"]
 	keyType, hasKeyType := options["key_type"]
 
-	hasGlobalAutomationOpts := hasACMECA || hasACMEDNS || hasACMECARoot || hasEmail || hasLocalCerts || hasKeyType
+	hasGlobalAutomationOpts := hasACMECA || hasACMECARoot || hasACMEDNS || hasACMEEAB || hasEmail || hasLocalCerts || hasKeyType
 
 	// if there are no global options related to automation policies
 	// set, then we can just return right away
@@ -396,6 +398,9 @@ func newBaseAutomationPolicy(options map[string]interface{}, warnings []caddycon
 		if acmeCARoot != nil {
 			mgr.TrustedRootsPEMFiles = []string{acmeCARoot.(string)}
 		}
+		if acmeEAB != nil {
+			mgr.ExternalAccount = acmeEAB.(*caddytls.ExternalAccountBinding)
+		}
 		if keyType != nil {
 			ap.KeyType = keyType.(string)
 		}

caddytest/integration/caddyfile_adapt/global_options.txt

@@ -9,6 +9,7 @@
 	}
 	acme_ca https://example.com
 	acme_ca_root /path/to/ca.crt
+
 	email test@example.com
 	admin off
 	on_demand_tls {

caddytest/integration/caddyfile_adapt/global_options_acme.txt

@@ -0,0 +1,85 @@
+{
+	debug
+	http_port 8080
+	https_port 8443
+	default_sni localhost
+	order root first
+	storage file_system {
+		root /data
+	}
+	acme_ca https://example.com
+	acme_eab {
+		key_id 4K2scIVbBpNd-78scadB2g
+		hmac   abcdefghijklmnopqrstuvwx-abcdefghijklnopqrstuvwxyz12ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefgh
+	}
+	acme_ca_root /path/to/ca.crt
+	email test@example.com
+	admin off
+	on_demand_tls {
+		ask https://example.com
+		interval 30s
+		burst 20
+	}
+
+	key_type ed25519
+}
+
+:80
+----------
+{
+	"admin": {
+		"disabled": true
+	},
+	"logging": {
+		"logs": {
+			"default": {
+				"level": "DEBUG"
+			}
+		}
+	},
+	"storage": {
+		"module": "file_system",
+		"root": "/data"
+	},
+	"apps": {
+		"http": {
+			"http_port": 8080,
+			"https_port": 8443,
+			"servers": {
+				"srv0": {
+					"listen": [
+						":80"
+					]
+				}
+			}
+		},
+		"tls": {
+			"automation": {
+				"policies": [
+					{
+						"issuer": {
+							"ca": "https://example.com",
+							"email": "test@example.com",
+							"external_account": {
+								"hmac": "abcdefghijklmnopqrstuvwx-abcdefghijklnopqrstuvwxyz12ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefgh",
+								"key_id": "4K2scIVbBpNd-78scadB2g"
+							},
+							"module": "acme",
+							"trusted_roots_pem_files": [
+								"/path/to/ca.crt"
+							]
+						},
+						"key_type": "ed25519"
+					}
+				],
+				"on_demand": {
+					"rate_limit": {
+						"interval": 30000000000,
+						"burst": 20
+					},
+					"ask": "https://example.com"
+				}
+			}
+		}
+	}
+}